Related Questions

Why does the ionosphere of the Earth's atmosphere facilitate radio communication? i. The presence of ozone causes the reflection of radio waves to earth ii. Radio waves have a very long wavelength
A i only
B ii only
C both i & ii
D neither i nor ii
Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?
A Troposphere
B Stratosphere
C Mesosphere
D Ionosphere
A salesman usually makes 25% profit on every radio he sells. During a sale, he reduces his profit margin to 20%, while his sales increase by 10%. What is the radio of his new profit to his usual profit?
A 10:25
B 11:15
C 22:25
D 20:25
The shear stress between the two liquid layers is __________ proportional to the distance between two layers.
A Directly
B Inversely
C Both A and B
D None of these
A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
A Increase
B Decrease
C Remain unaffected
D May increase or decrease; depends on the thickness of each layer
Which of the following layers of the Earth's atmosphere provide ideal flying conditions for Jet aircraft?
A Mesosphere
B Thermosphere
C Stratosphere
D Troposphere
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
A 0.05
B 1
C 6.5
D 15
The ionosphere overlaps which two layers of the atmosphere?
A Troposphere and Mesosphere
B Mesosphere and Stratosphere
C Ionosphere and Homosphere
D Exosphere and Thermosphere
The densest of all the atmosphere layers is ----
A troposphere
B stratosphere
C mesosphere
D ionosphere
the wzone in the upper layers of Earth's atmosphere is beneficial, ____ animal and plant life from dangerous ultraviolet readittion
A protecting
B withdrawing
C thwarting
D displacing

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